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Old 10-28-2016, 10:27 AM   #1
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PNWVAN's Avatar
Join Date: Sep 2016
Location: Seattle area
Posts: 140
Rear Heater Bypass

I recently fixed the blend door and replaced heater core for the front unit. The rear unit still blows cold air, but after some trail driving last week. The hard lines past the rear wheel sprung a leak. We did a quick by connecting the two rubber lines together and bypassing the rear unit totally.
Any reason why I cant make this a permanent fix? I have never used the rear unit and will probably be removing it once we decide on what build we are doing.
Should I by pass it closer to the engine and remove all the hard lines?
Right now bypassed with a nipple near the rear tire.

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Old 10-28-2016, 10:56 AM   #2
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Join Date: Jan 2009
Location: Corvallis, OR
Posts: 5,085
Rear heat can be bypassed or capped with no restrictions. The cleanest option is to swap the heater hoses for non-rear-heat models, then the rest of the system can be abandoned without worrying about springing a leak somewhere else in the rear plumbing.

Note - if you end up with rear A/C problems, they should be simply capped, because oil will pool in the lines and starve the compressor.
2000 E450 dually V10 wagon
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rear heater bypass

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